BadPaddingException

[Kristof Camelbeke]

Hi,

I want to store a user password encrypted in the database.
I've created a class based on an example using JCE.. Here are some code extracts :

//initializing...
SecretKey key = null;
        try {
            key = KeyGenerator.getInstance("DES").generateKey();
        } catch (NoSuchAlgorithmException nsae) {
            throw new BusinessException("[NoSuchAlgorithmException]", nsae);
        }
        try {
            ecipher = Cipher.getInstance("DES");
            dcipher = Cipher.getInstance("DES");
            ecipher.init(Cipher.ENCRYPT_MODE, key);
            dcipher.init(Cipher.DECRYPT_MODE, key);
       }
       ....
//encryting 
 byte[] utf8 = inStrng.getBytes("UTF8");
 // Encrypt
  byte[] enc = ecipher.doFinal(utf8);
  
//decrypting
 
  
 // Decode base64 to get bytes
    byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(inStrng);
 // Decrypt
    byte[] utf8 = dcipher.doFinal(dec);
 // Decode using utf-8
    return new String(utf8, "UTF8");
 

It works fine in my junit test which encrypts a given value and decrypts it to it's original.

The problem arrives when I save the encrypted password in the database (oracle). When I try to retrieve the encrypted String and try to decrypt it I receive the following Exception :

Caused by: javax.crypto.BadPaddingException: Given final block not properly padded
at com.sun.crypto.provider.SunJCE_h.b(DashoA6275)
at com.sun.crypto.provider.SunJCE_h.b(DashoA6275)
at com.sun.crypto.provider.DESCipher.engineDoFinal(DashoA6275)
at javax.crypto.Cipher.doFinal(DashoA6275)
....

The column in the database is of type varchar2 and has a length of 255.
I think it has something to do with the storage in the database since I can do the encryption/decryption in a unit test.

Any help is highly appreciated...

Thanks.

Kristof

[Ulf Dittmer]

Are the database and the database connection running in UTF-8 mode as well?